JP2008066898A - Transmitter and receiver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To transmit associated information while the amount of transmission of the associated information has been reduced. <P>SOLUTION: Video information from a DVD 27 is subjected to compression coding and encoded at an MPEG encoder section 20B and is transmitted in a packet. The associated information for controlling video information is processed simultaneously. The associated information is separated from the video information for processing. The video information generates a small number of errors, so that it is encoded in UDP protocols. The associated information is encoded based on TCP protocols by considering errors. The associated information is coded at a coding information generation section 34. The information is not transmitted over the entire period where the associated information is inserted, but the associated information and only information related to the accompanying information are compressed for transmission only for the first and last insertion periods of the associated information. Information for indicating the type of the accompanying information, and information for indicating the start/end of the accompanying information are encoded, thus greatly reducing the amount of information to be transmitted. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention is applied to an information transmission / reception system in which video information from video equipment can be viewed using a television receiver installed at a place different from the place where the video equipment is installed or outside. The present invention relates to a transmission device that can be used.

  Specifically, video information and accompanying information accompanying the video information can be transmitted without increasing the overall transmission amount.

  Carrying a terminal device with a video display unit on the go, controlling video equipment installed at home, for example, watching a broadcast received by a TV tuner in real time via a network line such as the Internet A system (information transmission / reception system) has been developed (for example, Patent Document 1).

  As the terminal device, in addition to a dedicated monitor, a personal computer (PC) such as a notebook personal computer, a video terminal display device (PlayStation Portable PSP (trademark)), or the like is used. Examples of video equipment include a TV, DVD, VTR, STB (set top box), and the like. These external video devices are controlled by a transmission device installed indoors.

  By accessing the transmission device from a terminal device outside the office (for example, a destination or a staying destination) via the Internet, control of the transmission device itself and control of external video equipment are performed. As a result, the recorded video can be enjoyed on the go by controlling the DVD and the like, and the tuner built in the transmission device can be controlled to send the selected broadcast program to the go. , You can enjoy the broadcast program in real time.

  By the way, among such various videos, there are those in which control information related to video information is added to the video information, such as accompanying information. Representative examples of the accompanying information include a copy guard signal and a wide screen detection signal.

  The accompanying information added to the video information can be said to be unnecessary information for the terminal device side configuring the information transmission / reception system described above. This is because there is little need to control the video on the terminal device side based on the accompanying information.

  For example, since the video display unit of the terminal device itself is not a very wide screen, even if a wide screen detection signal is received, the screen size cannot be changed based on this detection signal. Therefore, the information transmission / reception system described above is configured such that the accompanying information described above is omitted on the transmission device side and is not transmitted to the terminal device side.

  Where the terminal device is different from the place where the transmission device is placed. For example, an external video device and the transmission device are placed on the first floor and the terminal device is used on the second floor. However, the accompanying information is not transmitted to the terminal device side.

JP 2005-37981 A

  By the way, as one form of this information transmission / reception system, a form using a television receiver itself installed at home or outside as a video display means instead of using a terminal device provided with a display unit is conceivable.

  This is because a terminal device having a display unit must be excellent in portability in consideration of convenience, and the screen size of the display unit is inevitably reduced. When the screen size is small, it is often experienced that the video lacks a sense of realism and does not provide sufficient satisfaction. In the case of a stationary television receiver, in most cases, the screen size is larger than that of the terminal device, so that such a problem can be eliminated.

  In this way, when using a television receiver installed outside the office as a video display means, instead of the terminal device described above, a receiving device that functions as a relay device is required. The receiver is connected and used between the receiver and the LAN line of the destination and the television receiver.

  Therefore, as a reception apparatus, the reception information (digital compressed signal) sent from the transmission apparatus is decoded and returned to the original television signal (for example, an analog television signal composed of a video signal and an audio signal). It is necessary to have a signal conversion processing function. Then, by supplying the analog television signal obtained at the output terminal of the receiving device to the input terminal of the television receiver provided, it is possible to enjoy the video displayed on the clear screen.

  However, in this case, when this receiving apparatus is applied to the information transmission / reception system described above, only the video information with the accompanying information removed is transmitted from the transmitting apparatus, and of course, the accompanying information is deleted from the receiving apparatus. TV signal is output. Therefore, even if the video signal originally has accompanying information for copy guard inserted, the output signal can be copied by using the output signal of the receiving apparatus.

  In order to prevent this, the accompanying information may be transmitted to the receiving apparatus side simultaneously with the video information. However, when transmitting video information or the like, only video information (only effective pixels) is transmitted to reduce the transmission amount, and information on the blanking period is not transmitted. Therefore, it is often inserted in the blanking period. If this accompanying information is to be transmitted, the blanking period information must also be digitized and transmitted, which naturally increases the overall transmission amount accordingly.

  Accordingly, the present invention solves such a conventional problem, and proposes a transmitting apparatus and a receiving apparatus that can transmit accompanying information without particularly increasing the transmission amount.

In order to solve the above-mentioned problem, a transmission device according to the present invention described in claim 1 is a transmission device that transmits video information to which accompanying information is added in a form suitable for transmission,
A detector for detecting the accompanying information;
A separation unit that separates the video information and the accompanying information;
A signal processing unit that packetizes the separated video information and accompanying information after compression encoding,
A LAN interface unit for communication,
The video information and the accompanying information are transmitted in different data formats.

  The present invention described in claim 1 can be applied to an information transmission / reception system. The information transmission / reception system includes an information transmission device and its reception device, and information received by the reception device is displayed by an existing television receiver functioning as a video display means. When the transmission device is installed on the first floor of the home, the television receiver and the reception device are installed in another room on the same floor or on another floor, and information is transmitted and received in a state of being separated from the transmission device. .

  The transmission device and the reception device are connected by wired communication or wireless communication. In either case, communication is performed by a wired LAN that conforms to the IEEE 802.3 standard or a wireless LAN that conforms to the IEEE 802.11a / b / g standard. There are a case where the transmitting device and the receiving device are connected by a wireless LAN line, and a case where a router is connected to the transmitting device and the router and the receiving device are connected by a wired LAN connected by a LAN cable. Therefore, each of the transmission device and the reception device includes the LAN interface unit (described later).

  The transmission device is controlled by a control signal from the reception device. The receiving device is controlled by a remote controller. Information to be controlled is performed by selecting an item displayed on the television receiver. Display control software such as the contents of items to be displayed on the television receiver is stored in the receiving apparatus, and selection of software and display items (menus, etc.) are performed by a remote control signal.

  The information transmission apparatus includes a television tuner and an external input terminal. External video equipment such as a DVD, a VTR, and an STB is connected to the external input terminal.

  In the transmission device, the input video information is converted (encoded) into transmission information in a format suitable for transmission. For example, video information (including audio information; the same applies hereinafter) is compressed and encoded by the MPEG method, then encrypted, and packetized for transmission. Transmission of packet information is wired or wireless as described above.

  When the external video information includes accompanying information for controlling the video information, the information processing is also performed at the same time. The accompanying information is copy guard information such as CGMS (Copy Generation Management System) as copy control information.

  The accompanying information is processed separately from the video information. Video information itself has an error correction function, or even if an error occurs, the video is temporarily disturbed but recovered, so it depends on the UDP / IP (User Datagram Protocol / Internet Protocol) protocol at OSI reference level Encoded. On the other hand, the accompanying information is encoded according to the TCP / IP (Transmission Control Protocol) protocol in consideration of errors. This is because if an error occurs in the transmission process, the video information cannot be controlled correctly on the receiving device side.

  The accompanying information does not transmit the information over the entire period in which the accompanying information is inserted, but transmits only the accompanying information and information related to the accompanying information only at the beginning and end of the accompanying information insertion period. . That is, the accompanying information is compressed and transmitted. Information indicating the type of the accompanying information and information indicating the start and end of the accompanying information are encoded. As a result, the amount of information to be transmitted can be greatly reduced. The accompanying information may be transmitted intermittently at certain time intervals.

According to a fifth aspect of the present invention, there is provided a communication LAN interface unit;
Of the information received by the LAN interface unit, a signal processing unit that decodes video information and accompanying information separately;
A video signal encoding unit for reconstructing the decoded video information into a video signal with a synchronization signal added thereto;
An accompanying information generation unit that generates original accompanying information from the decoded accompanying information;
A signal synthesizer that synthesizes the generated accompanying information with the video signal;
It has an output terminal for the video signal.

  In the receiving device, signal processing reverse to the signal processing in the transmitting device is performed to restore video information and the like. The video information is reconstructed as a composite signal or a separate signal in accordance with the television system. When the accompanying information exists, the accompanying information is output to the output terminal in a state of being synthesized (superposed) on the composite signal or the like.

  Since the signal obtained at the output terminal is a composite signal (separate signal), an image can be displayed immediately when it is supplied to the television receiver.

  By acquiring this video information via a network line (Internet line), if a signal from the receiving device is supplied to the television receiver, a broadcast program can be enjoyed even when away from home.

  In the transmission device of the present invention, when accompanying information is added to the video information, the information related to the accompanying information is encoded differently from the video information, and the information is compressed and transmitted. It is.

  According to this, the accompanying information related to the video information can be transmitted together with the video information, and the transmission amount of the accompanying information can be compressed.

  In the receiving apparatus of the present invention, a composite signal or a separate signal is reproduced from the received video information, and when accompanying information is added, the accompanying information is superimposed on the composite signal or separate signal and output. It is a thing.

  According to this, since the accompanying information can be reliably reproduced, the video can be accurately controlled based on the accompanying information even if the reproduced composite signal or the like is used.

  Subsequently, preferred embodiments of the transmitting apparatus and the receiving apparatus according to the present invention will be described in detail with reference to the drawings.

(Information transmission / reception system)
The present invention can be applied to an information transmission / reception system. As shown in FIG. 1, the information transmission / reception system includes an information transmission device 20 and a reception device 50. Information received by the reception device 50 is displayed by an existing television receiver 60 functioning as a video display means. Is done. When the transmission device 20 is installed on the first floor of the home, the television receiver 60 and the reception device 50 are installed in different rooms on the same floor or on different floors, and the information is stored in a state away from the transmission device 20. Transmission / reception is performed.

  The transmission device 20 and the reception device 50 are connected by wired communication or wireless communication. In either case, communication is performed by a wired LAN conforming to the IEEE 802.3 standard or a wireless LAN conforming to the IEEE 802.11a / b / g standard. In FIG. 1, an example in which the transmission device 20 and the reception device 50 are connected by a wireless LAN line La, a router 80 is connected to the transmission device 20, and the router 80 and the reception device 50 are connected by a LAN cable Lb. Thus, an example in which the transmission device 20 and the reception device 50 are connected by a wired LAN line is shown. Therefore, each of the transmission device 20 and the reception device 50 includes the above-described LAN interface unit (described later).

  The transmission device 20 is controlled by a control signal from the reception device 50. The receiving device 50 is controlled by the remote controller 90. Information to be controlled is performed by selecting items displayed on the television receiver 60. Display control software such as the contents of items to be displayed on the television receiver 60 is stored in the receiving device 50, and selection of software and display items (menus, etc.) are performed by a remote control signal.

  The information transmission device 20 incorporates a television tuner as will be described later. A television signal (for example, a terrestrial analog television signal) received by the external antenna 22 is supplied to a built-in television tuner. Channel selection is performed by a channel selection signal from the receiving device 50. Therefore, channel selection is performed from the remote controller 90 side.

  The transmission device 20 also has an external input terminal 26. A video device (external video device) 27 is connected to the external input terminal 26. The external video equipment 27 may be a DVD, VTR, STB, or the like. FIG. 1 shows a case where a DVD is connected, and reproduction control for the DVD 27 is controlled from the receiving device 50 side via the transmitting device 20. Although one external input terminal is illustrated in FIG. 1, the number of external input terminals installed so as to accept a plurality of video inputs is arbitrary. In order to control the DVD 27 from the transmission device 20, a device control element 44 for emitting a control signal (remote control signal) is set near the light receiving portion of the DVD 27.

  The video information is converted into transmission information in a format suitable for transmission by the transmission device 20. For example, video information (including audio information; the same applies hereinafter) is compressed and encoded by the MPEG method, and then the elementary stream (ES) is encrypted and then packetized and transmitted. Transmission of packet information is wired or wireless. In contrast to wired transmission, in the case of wireless transmission, double encryption is performed. This is to improve the confidentiality of information. The encryption uses a DES (Data Encryption Standard) method, an AES (Advanced Encryption Standard) method, a WEP (Wired Equivalent Privacy) method, and other encryption methods.

  The packet information is transmitted after the communication between the transmission device 20 and the reception device 50 is established. The receiving device 50 decodes the received packet information and generates a television signal. Therefore, decompression decoding processing is performed by an MPEG decoder (described later). Of the decoded information, the audio information is converted to an analog audio signal and supplied to the output terminal of the receiving device 50.

  The decoded video information is further encoded according to the television system, reconstructed into an NTSC system or PAL system television signal including a synchronization signal, and then supplied to the output terminal of the receiver 50. The

  When the transmission information from the transmission device 20 includes accompanying information for controlling the video information together with the video information, the information processing is also transmitted at the same time. The accompanying information is copy guard information, such as CGMS (Copy Generation Management System) as copy control information, macrovision information, and the like.

  When the accompanying information is received together with the video information, the accompanying information is decoded and returned to the original accompanying information, and then added to the video signal. Since this type of accompanying information is generally inserted in the vertical blanking period, the accompanying information is inserted in a predetermined horizontal period of the vertical blanking period.

  As the television signal, both a composite signal and a separate signal are output. Therefore, the receiving device 50 is provided with an output terminal for composite signals (video / audio terminal) and an output terminal for separate signals (so-called S terminal). When accompanying information is included in the television signal received by the receiving device 50, the attached information is also inserted into the television signal (composite signal or separate signal) obtained from these output terminals. Is done. This is to enable copy control or the like according to accompanying information when copying by connecting an output terminal to a copy machine (VTR, DVD, etc.).

  The output terminal of the receiving device 50 and the television receiver 60 are connected by a dedicated cable 61, and display of control information from the remote controller 90 and display of received video are performed.

  As shown in FIG. 1, a network line (Internet line) 110 is connected to the router 80 via a modem 100. As the modem 100, a modem according to the use environment such as an ADSL or ISDN modem or an optical fiber modem is selectively used.

  With the configuration shown in FIG. 1, it is possible to access a Web server (not shown) connected to the Internet line 110 via the receiving device 50 and the transmitting device 20 using the remote controller 90. Web page information can be acquired and displayed on the television receiver 60.

  Alternatively, a software keyboard is displayed on the screen of the television receiver 60 to create a mail, access a mail server (not shown) to send the mail, receive a mail, and receive the contents as the television receiver 60. It is possible to send and receive information such as displaying on the screen.

  With this information transmission / reception system 10, for example, a broadcast program received by the transmission device 20 can be viewed in real time on a television receiver 60 installed in a room different from the transmission device 20. Various information can also be acquired by accessing a Web page.

(About remote controller 90)
FIG. 2 shows an example of a remote controller 90 for realizing the processing described above. The remote controller main body 91 includes an operation button system 92 for controlling the power supply and volume of the television receiver 60 itself, and an operation button system 93 for controlling the transmission device 20 and the like via the reception device 50. There are cursor keys (indicated by arrows), an enter button 95, and the like below the center of the main body. Infrared (IR) is used for the remote control signal.

  One of the operation button systems 92 includes a button for controlling on / off of the power supply for the television receiver 60. The input switching button is a button used when performing input switching on the television receiver side, and the volume is adjusted with the + and − buttons. The sound can be temporarily muted by the mute button.

  In the other operation button system 93, the input switching button is a button for controlling an input selection unit provided in the transmission device 20, and the screen display button is a current operation state of the receiving device 50 or The operating state of the external video equipment 27 is displayed as a bar at the top of the screen of the television receiver 60. The setting button is a button used when displaying the setting screen on the screen of the television receiver 60. The button for the screen remote control is a button used when selecting an item displayed on the screen of the television receiver 60 by using the cursor key.

  In addition to the line connection processing with the transmission device 20 by the option button, processing for adjusting video and audio such as video on the television receiver 60 and the transmission device 20 side is executed by using the cursor key together. . The cursor remote control button is a button used to directly select a display menu (displayed on the television receiver 60) for the external video equipment 27 connected to the transmission device 20. The return button is used when returning to the previous screen.

  Although not shown, the television receiver 60 displays an icon indicating a connection state with the transmission device 20. The line connection state by wireless LAN (connection and connection impossible), the line connection state by wired LAN (connection and connection impossible), the connection state to the transmission device 20, and the like are displayed by corresponding icons.

(About the transmitter 20)
FIG. 3 shows another example of usage of the information transmission / reception system 10. This example is an example of usage in places such as where to stay and where to leave.

  In FIG. 3, for convenience, the home area 120 and the outing area 130 will be described separately. As described above, the home area 120 includes the transmission device 20, the external video equipment 27 connected thereto, and the router 80 and the modem 100 for connecting to the Internet line 110. A plurality of receiving devices 50 and a television receiver 60 can be installed in the home area 120.

  The outside area 130 includes a modem 140 for connecting to the Internet line 110, a router 150 for the LAN line for connecting to the modem 140, and the television receiver 60. When enjoying video using the television receiver 60, a single or a plurality of receiving devices 50 are connected between the router 150 functioning as an access point and the television receiver 60 via a LAN line. . As shown in the figure, the connection to the LAN line includes a wired LAN that connects the router 150 and the receiving device 50 using the LAN cable Lc, and a case where the receiving device 50 and the router 150 are connected by the wireless LAN Ld. It is done.

  After starting up the receiving device 50 and accessing the transmitting device 20 installed on the home area 120 side via the Internet line 110 to establish communication with the receiving device 50, a transmission medium such as video is selected. . For example, a tuner built in the transmission device 20 is controlled. Broadcast program information currently being broadcast selected by the tuner is sent to the receiving device 50 via the Internet line 110. This makes it possible to view the broadcast program currently being broadcast in real time using the television receiver 60 on the go.

  By controlling the external video equipment 27 in the home area 120, for example, a video reproduced from a DVD can be viewed. It is also possible to access a Web server connected to the Internet line 110, and to create and send / receive mail.

  Note that the receiving device 50 that is carried outside can be a receiving device used in the home area 120 or a receiving device that is separate from the receiving device. The initial setting is made so that the transmitter 20 can be accessed even when a receiver 50 different from that used is carried.

  FIG. 4 shows an embodiment of the transmission apparatus 20. The transmission device 20 includes a video input unit 20A, a signal processing unit 20B that converts an input video into a data format suitable for transmission, a LAN interface unit 20C, the video input unit 20A, a signal processing unit 20B, and a LAN interface unit. 20C and a control unit 20D for controlling the external video equipment 27, respectively.

  In the video input unit 20A, a television signal received by the antenna 22, for example, a terrestrial analog television signal (hereinafter referred to as a television signal) is supplied to a tuner 24 through an input terminal 23, and the tuner 24 selects a desired broadcast station. Is selected. The broadcast program of the selected channel is supplied to the signal selection unit 25.

  An external video device 27 is connected to the other input terminal 26. As the external video equipment 27, a DVD, a VTR, an STB or the like can be considered. In FIG. 4, a DVD 27 is connected. Video information (including audio information) reproduced on the DVD 27 is supplied to the AV input unit 28 via the input terminal 26 and separated into a video information part (effective pixel part in the case of a video signal) and a blanking part. .

  The video information portion is supplied to the signal selection unit 25, and the blanking portion is supplied to the A / D conversion unit 29, converted into a digital signal, and then supplied to the control unit 20D. The blanking portion includes both a horizontal blanking period and a vertical blanking period.

  In the AV input unit 28, the blanking part and the other part are separated because the accompanying information for controlling the video information is inserted and added to the video information output from the DVD 27 or the like. Therefore, when accompanying information is added, this accompanying information is separated from other information for signal processing.

  The accompanying information may be copy guard information, a wide detection signal for switching the screen size, or the like. The copy guard information is information indicating whether the reproduced video information is content that can be copied (recorded), write-once, or copy prohibited. As copy guard information, CGMS which is duplication control information, Macrovision, etc. can be considered.

  The signal selection unit 25 selects a television signal and a video information portion (hereinafter referred to as video information), and any of the selected video information is supplied to the signal processing unit 20B. The signal processing unit 20B is provided for conversion into a signal form (data format) suitable for transmission based on the control of the control unit 20D. In this example, data compression by the MPEG-2 or MPEG-4 system is performed. The signal is processed using the format. Therefore, the signal processing unit 20B functions as an MPEG encoder unit (hereinafter referred to as an MPEG encoder unit).

  The video information is subjected to digital conversion processing and compression / encoding processing in the compression / encoding unit 31 to be converted into an elementary stream ES of video and audio in accordance with the MPEG system. The video elementary stream and the audio elementary stream are encrypted in the next encryption unit 32.

  As the encryption method, as described above, the DES method, the AES method, the WEP method, and the like can be considered. In the case of a wired LAN, either the DES method or the AES encryption method is adopted, while in the case of wireless LAN communication, for example, the AES method is considered in consideration of confidentiality. Double encryption is used in which encryption is performed and encryption is further performed by the WEP method. For this reason, the encryption processing in the encryption unit 32 is selected depending on whether communication is performed using a wired LAN or wireless LAN.

  The encrypted video elementary stream and audio elementary stream are supplied to the packet generation unit 33 and subjected to packet processing according to a predetermined protocol.

  The packet generation process differs depending on the mode in which the receiving device 50 is used as the home area 120 shown in FIG. 3 (referred to as home area mode) and the mode used as the out-of-place area 130 (referred to as outing area mode). To do.

  In the home area mode, a program stream PS (MPEG-PS) generated using a plurality of packetized elementary streams PES (Packetized Elementary Stream) is defined in the UDP / IP protocol of the OSI reference model. It is generated as a packet having a formatted format. The reason why the program stream is used is that it is used in an environment (in the home) where the possibility of error is low. In addition, a high bit rate (about 10 Mbps) is secured as the transmission rate at this time.

  Further, in the case of the outing area mode, a transport stream TS (MPEG-TS) generated using a plurality of packetized elementary streams PES is converted into RTP / IP (Real-time) of the OSI reference model. It is generated as a packet having a format defined in the Transport Protocol / Internet Protocol) protocol. The transport stream is used in an environment where an error may occur. In addition, the transmission rate at this time is about 300 to 500 Kbps although it varies depending on the Internet environment.

  When the receiving device 50 is powered on, a search process is performed to determine whether or not a specific transmitting device 20 that is a network-connected device exists in the LAN line that can communicate with the receiving device 50. When the transmitting device 20 exists Is determined to be in the home area mode, the transmission apparatus 20 is instructed to perform signal processing in the home area mode.

  Similarly, when there is no transmitting device 20 in the LAN line (outing destination LAN line) as in the case of use in the outing destination, it is determined as the outing area mode and signal processing is performed in the outing area mode. Instructions are made. Based on the signal processing instruction in this mode, the signal processing as described above is executed.

  In the packet generator 33, in addition to the video information described above, packet processing of accompanying information is also performed. According to the above example, the accompanying information is copy guard information, CGMS information, and macrovision information. When the accompanying information is added to the video information, the accompanying information is also packetized and transmitted.

  When the accompanying information is added to the video information, the encoded information generating unit 34 encodes the accompanying information at the timing when the accompanying information is added. The encoded associated information (accompanying encoded information) is packetized after the packet generation unit 33 performs format processing based on the format applied to the information transmission / reception system described above. The accompanying information packet is generated as a packet in a format defined in the TCP / IP protocol so that it can cope with an error occurring in the transmission path.

  In the encoded information generation unit 34, only the timing of the horizontal scanning period in the first blanking period to which the accompanying information is added and the timing of the horizontal scanning period in the last blanking period to which the accompanying information is added are attached twice. Encoding information is generated. This is because the same information is transmitted during the period in which the accompanying information is added, so that the amount of information can be reduced.

  The accompanying information does not transmit the information over the entire period in which the accompanying information is inserted, but transmits only the accompanying information and information related to the accompanying information only at the beginning and end of the accompanying information insertion period. . That is, the accompanying information is compressed and transmitted. Information indicating the type of the accompanying information and information indicating the start and end of the accompanying information are encoded. As a result, the amount of information to be transmitted can be greatly reduced. The transmission form (pattern) of the accompanying information is not limited to this example. For example, an intermittent transmission form in which the accompanying information is transmitted at certain time intervals may be used.

  The LAN interface unit 20C includes a wired LAN interface unit 35 and a wireless LAN interface unit 36. A LAN connector 35a is connected to the input side of the wired LAN interface unit 35, and its output is connected to the control unit 20D. Similarly, an antenna element 37 for transmission / reception is connected to the wireless LAN interface unit 36. The output is connected to the control unit 20D. An interface unit 46 having a connection connector 46a for the router is connected to the internal bus constituting the control unit 20D. Of course, the router interface unit 46 can also be used as the wired LAN interface unit 35. In this example, any of the interface units 35 and 36 described above is configured by a LAN interface that conforms to the IEEE 802.3 or IEEE 802.11a / b / g standard.

  The LAN interface unit 20C is for performing communication with the receiving device 50. Based on the received information, the LAN interface unit 20C controls the external video equipment 27 and the Internet line 110 in addition to controlling the transmitting device 20 itself. Connection to is performed.

  The control unit 20D has a control means 40 using a CPU for controlling the entire apparatus, and a memory means 42 is connected to the internal bus via a memory controller 41. The memory means 42 includes a ROM that stores various processing programs and a RAM that functions as a working area. The control unit 20D is further supplied with a light receiving signal from the remote control light receiving unit 45.

  The control unit 20D generates a control signal for the tuner 24 and the signal selection unit 25 constituting the video input unit 20A, and also supplies a separation signal to the AV input unit 28, so that a blanking portion and the others are supplied. The separation process is performed. Further, a control signal for remote control for the DVD 27 is generated via the controller 43. In this example, the control signal is supplied to a device control element (light emitting element) 44 for an optical signal (infrared ray) attached near the light receiving portion of the DVD 27.

  Further, in addition to the control processing corresponding to the home area mode and the outing area mode for the MPEG encoder 20B constituting the signal processing unit, packet generation processing when accompanying information exists is executed.

  The predetermined packet data generated by the MPEG encoder unit 20B is received in the receiving device 50 in the home area 120 or in the outing area 130 connected to the Internet line 110 via the wired LAN interface unit 35 or the wireless LAN interface unit 36. Is sent to the receiving device 50. Further, data exchange processing such as obtaining information from a Web server connected to the Internet line 110 via the router 80 and sending it to the receiving device 50 is performed.

(Receiver 50)
FIG. 5 shows an embodiment of the receiving device 50. The receiving device 50 includes a LAN interface unit 50A, a signal processing unit 50B that returns a signal received by the LAN interface unit 50A to an original signal, a control unit 50C, and a remote control signal processing unit 50D.

  The LAN interface unit 50 </ b> A is an interface unit for receiving an information signal transmitted from the transmission device 20 and transmitting a control signal or the like to the transmission device 20. The interface unit 50A in this case also constitutes a LAN interface that conforms to the IEEE802.3 or IEEE802.11a / b / g standard. The interface unit 50A includes a wired LAN interface unit (Ethernet (registered trademark) module) 52 and a wireless LAN interface unit 53. The wired LAN interface unit 52 has a LAN connector 52 a, and the wireless LAN interface unit 53 has an antenna element 54.

  These interface units 52 and 53 are connected to an internal bus of a CPU 70 constituting a control unit 50C described later via a PCI bus, and an information signal received by the interface units 52 and 53 is sent to the signal processing unit 50B via the CPU 70. Supplied.

  The signal processing unit 50B functions as an MPEG decoder unit. The MPEG decoder unit 50B includes an MPEG decoder 54 connected to an internal bus, a video encoder 57 to which video data output from the MPEG decoder 54 is supplied, and an accompanying information reproduction unit 59 that decodes the associated encoded information. Is done.

  The MPEG decoder 54 decodes the encrypted and packetized video elementary stream (ES) and audio elementary stream included in the received information signal (data signal), the video elementary stream, Decompression and decoding processing into the audio elementary stream is performed. The decoded audio elementary stream is supplied to an audio D / A converter 55 and returned to an analog audio signal. The analog audio signal is supplied to the second signal synthesis unit 56.

  The restored video elementary stream is supplied to a video encoder (video signal encoding unit) 57 to perform analog conversion processing of the video signal, convert the analog video signal into a predetermined television system, and separate the composite signal Sc and the separate video signal. Signal processing for outputting the signal Ss in two formats is performed. At the same time, a synchronization signal is added to the video signal. In this example, the television system refers to the NTSC system or the PAL system. The analog video signal (composite signal Sc and separate signal Ss) is supplied to the first signal synthesis unit 58.

  The accompanying encoded information decoded by the MPEG decoder 54 is supplied to the accompanying information reproducing unit 59 to reproduce the accompanying information. At the same time as the accompanying information is the first signal synthesis at a predetermined horizontal period of the vertical blanking period. Supplied to the unit 58. The first signal synthesizer 58 inserts and adds the accompanying information supplied at a predetermined horizontal period to the video signal and supplies the video signal to the second signal synthesizer 56.

  The second signal synthesizer 56 synthesizes an analog audio signal with the composite signal Sc and supplies it to the first output terminal (video / audio terminal) 65a, and synthesizes the analog audio signal with the separate signal Ss to generate the second signal. Output terminal (S terminal) 65b. Therefore, when accompanying information is included in the television signal received by the receiving device 50, the accompanying information is also added to the television signals (composite signals and separate signals) obtained from the output terminals 65a and 65b. Is output in the processed state.

  The control unit 50 includes a CPU 70 that performs signal processing. Memory means 72 is connected to the internal bus of the CPU 70 via a memory controller 71. The memory means 72 is a ROM that stores a processing program for performing MPEG decoding processing on the information signal received by the LAN interface unit 50A and decoding associated information, and temporarily stores processing data. It is composed of a RAM that functions as a working memory. In this example, the MPEG decoder 50B and the CPU 70 (shown by broken lines) are made into one chip.

  The remote controller control unit 50D includes a remote control signal light receiving unit 75 and a sub microcomputer (sub microcomputer) 76 to which the received remote control signal is supplied. In response to the remote control signal, starting processing for line establishment processing for the transmission device 20, control processing for the transmission device 20 itself, control processing for the external video equipment 27, and the like are executed. Therefore, the sub microcomputer 76 passes these processing signals to the CPU 70.

  A display unit 78 is connected to the sub microcomputer 76 via a display controller 77. The display unit 78 is provided with a plurality of indicator lamps. In the example of FIG. 5, there are a power indicator, an indicator lamp that lights when a wired LAN line is established (wired LAN), an indicator lamp that lights when a wireless LAN line is established (wireless LAN), and the like. Each of these indicator lights uses an LED.

  The receiving device 50 described above is excellent in miniaturization and portability because it does not include a display unit (monitor screen) for displaying video, means for storing video, and the like. Therefore, this kind of receiving device 50 can be provided at low cost and can be easily carried even when going out.

(About processing in the receiving device 50)
An example of processing in the information transmitting / receiving system 10 configured as described above will be described below.
FIG. 6 is a flowchart illustrating an example of an initial setting process between the reception device 50 and the transmission device 20, and is processing performed on the reception device 50 side.

  As shown in FIG. 3, the receiving device 50 may be used in the home area 120 or in the outing area 130. When used in the home area 120, the transmission device 20 is connected to the home LAN line, whereas in the case of the outing area 130, the transmission device 20 is connected to the outside LAN line. Absent. The home area 120 and the destination area 130 are distinguished from each other depending on the presence or absence of the transmission device 20. Further, since the communication speed and the data processing method are different between the home area 120 and the outing area 130, communication processing conditions corresponding to the home area 120 and the outing area 130 are ensured in the initial setting process. Process.

  Therefore, the receiving device 50 has such communication processing conditions, and means capable of communicating with the target device (transmitting device 20) connected to the network without worrying about where the receiving device is used. An initial setting program is installed.

  The means is firstly transmission means for broadcasting to all devices connected in the same network line, and secondly, a specific device is included in a reply signal to the transmitted signal. It is a discriminating means for discriminating whether or not there is information (identifier) for identification. Third, when a reply signal including the identifier is received, the device is connected to the same network line. As a means for setting communication conditions for the device. In addition to these, the means includes a LAN interface unit that communicates with a network connection device.

Subsequently, a processing example based on the initial setting program will be described below with reference to FIG.
In FIG. 6, when the power of the receiving device 50 is turned on, this initial setting program is started, and a broadcast packet for confirming the transmitting device 20 for all devices connected to the LAN line (network area). A signal is transmitted (step 201). The initial setting signal is a packet signal.

  All devices connected to the LAN line receive this broadcast packet signal (initial setting signal). When the own device is the transmitting device 20, identification information (an identifier such as a code or a flag) indicating that the own device is the transmitting device 20 is inserted and returned in a specific bit included in the packet signal (step) 202).

  All devices connected to the LAN line send a reply to the broadcast. The receiving device 50 determines the presence or absence of the transmitting device 20 based on whether or not a packet signal including identification information (identifier) indicating the transmitting device 20 is received in the returned packet.

  In step 202, the content of the reply signal to the broadcast packet signal is determined. If an identifier is inserted in a specific bit, it is determined that the transmitting device 20 is connected to the same LAN line. When the presence of the transmission device 20 is confirmed in step 202, communication processing conditions for initial setting for the transmission device 20 (communication processing conditions for the home area) are secured in step 203.

  As a communication processing condition for the home area, first, the protocol of the OSI reference model is set for the home area mode (UDP / IP protocol). Second, the communication speed is set. In the home area mode, a high bit rate (about 10 Mbps) is set. Third, the screen size on the receiving device 50 side is set. Since the bit rate and the like are set, this step 203 can be said to be a capability exchange processing step.

  After securing the communication processing conditions as the initial setting information, communication with the transmission device 20 is performed. When communication is established, each information indicating the secured (saved) communication processing conditions or a corresponding setting flag is displayed. It is transmitted to the transmitting device 20 side (step 204). Based on the information indicating the communication processing conditions and the setting flag, the transmission device 20 executes signal processing according to the MPEG system based on the designated protocol.

  If it is determined in step 202 that there is no reply signal including the identifier, it is determined that the transmission device 20 is not connected to the same LAN line. That is, in this case, the receiving device 50 determines that the initial setting process is performed from the outside area 130. Therefore, in this case, a setting screen necessary for controlling the transmission device 20 from outside is displayed on the television receiver 60 (step 205).

  In this setting screen, in consideration of the presence of a plurality of transmission devices 20, a selection is made as to which transmission device 20 to communicate with. For example, a setting screen as shown in FIG. 7 is displayed, and a specific transmission device 20 is designated. By designating the transmission device 20 and then pressing a “connection” key displayed side by side on the designated transmission device 20, the apparatus enters a standby state for connection processing to the Internet line.

  Thereafter, in step 206, processing for securing communication processing conditions is performed. Since the receiving device 50 is a destination, in this case, the destination area mode is set, and the communication processing conditions for the destination area mode are ensured. First, the protocol of the OSI reference model is set for a destination area mode (RTP / IP protocol). Second, the communication speed is adjusted to the Internet line. Third, the screen size on the receiving device 50 side is set.

  After the information indicating such communication processing conditions is secured, the connection standby state to the Internet line 110 is released (step 207). As a result, communication with the transmission device 20 is performed via the Internet line 110, and the transmission device 20 changes to signal processing based on this initial setting information.

  Thus, by automatically checking whether or not the transmitting device 20 is connected to the home LAN line when the power of the receiving device 50 is turned on, signal processing suitable for each use area can be automatically set. . The communication processing conditions described above are examples, and the number of setting items is not limited to the example.

(Attachment information discrimination process)
FIG. 8 is a flowchart illustrating an example of the accompanying information determination process.
When a variable indicating the presence / absence of accompanying information is expressed as “FLAG”, the variable FLAG is first reset (= 0) in the flowchart shown in FIG. 8 (step 210). After the variable FLAG is reset (FLAG = 0), the vertical synchronization signal VSync is detected (step 211).

  When this first vertical synchronizing signal is detected, the count C of the counter for the horizontal synchronizing signal is reset (C = 0) (step 212), and when the reset process is completed, it waits until the horizontal synchronizing signal is detected. (Step 213). When the horizontal synchronization signal is detected, the count number C is incremented by “1” (step 214). This counting process is continued until the number of horizontal synchronizing signals H reaches a predetermined number (for example, C = 10) (step 215). This is because the accompanying information is inserted between the 10th horizontal synchronization signal and the 17th horizontal synchronization signal in the vertical blanking period.

  The presence of accompanying information is confirmed during the horizontal scanning period when the count number C reaches a predetermined number (= 10) (step 216). If the presence of the accompanying information is not confirmed during the tenth horizontal scanning period, the variable FLAG is left in the initial state (step 217), and the process for confirming the existence of the accompanying information is continued. That is, the process for confirming the presence of the accompanying information is continued until the number of horizontal synchronization signals H exceeds 18 (steps 218 and 212).

  When the number of horizontal synchronization signals H exceeds 18, the process proceeds to step 210, and the arrival of the next vertical synchronization signal is detected again. When accompanying information is inserted in the video information, it is normal to insert this accompanying information from the first vertical blanking period. The same process is repeated until the source is switched.

  Even when the vertical blanking period comes again and a vertical synchronization signal is detected (step 211), the processing after step 212 is continued with the count number of the horizontal synchronization signal H reset. When the number of horizontal synchronization signals reaches a predetermined number (C = 10) and the presence of accompanying information is confirmed within the horizontal scanning period (step 216), the process proceeds to step 220.

  In step 220, the state of the variable FLAG is discriminated. When FLAG = 0, this is inverted (FLAG = 1) and then the process proceeds to the accompanying encoding process for performing the packet generation process (steps 221 and 222). . This accompanying encoding process is the accompanying encoding process in FIG. 4 and includes code information indicating the type of the accompanying information, code information corresponding to the accompanying information, and code information (flag F indicating the start of the accompanying information). = 1). The associated encoded information encoded as described above is packetized in the MPEG encoder 50B.

  Since the count C of the horizontal synchronization signal H at that time is less than “18” (step 218), the process returns to step 213, and transitions to the horizontal synchronization signal H detection mode. When the next horizontal synchronizing signal H is detected and accompanying information inserted in the horizontal scanning period is detected (steps 214, 215, 216), the state of the variable FLAG is determined (step 220). Since insertion of accompanying information is detected in the immediately preceding horizontal scanning period, the variable FLAG is FLAG = 1. Therefore, the accompanying encoding process is not performed depending on the accompanying information detected for the second time, and the process proceeds from step 220 to step 218. This process continues until no additional information is detected.

  As described above, accompanying information is detected in the tenth horizontal scanning period, and accompanying coding processing related to the accompanying information is performed, but no subsequent processing is performed. The same encoding process is performed on the same accompanying information because it is not preferable from the viewpoint of reducing the amount of transmission information.

  Now, when the count number C of the horizontal synchronizing signal H exceeds “18”, the accompanying information is no longer inserted in the next horizontal scanning period. In this case, the absence of the accompanying information is confirmed in step 216. At the same time, in step 217, the state of the variable FLAG is confirmed (step 217). Since the variable FLAG remains FLAG = 1, the variable FLAG is inverted (FLAG = 0) in this case (step 230). Thereafter, an accompanying encoding process is executed (step 231). The accompanying encoding process in this case is each encoding process of code information indicating the type of the accompanying information, code information corresponding to the accompanying information, and code information (flag F = 0) indicating the end of the accompanying information.

  When the accompanying information is detected in this way, encoding processing according to the content of the accompanying information, code information (flag F) indicating the start and end of the accompanying information, and the like are encoded. On the receiving device 50 side, the content of the accompanying encoding is decoded, and when accompanying information is present, the accompanying information is inserted into the video signal and output in a predetermined horizontal scanning period. It is possible to restore the original video signal with the information inserted. By compressing the accompanying information and transmitting it, the transmission amount of the accompanying information can be greatly reduced.

  In the information transmission / reception system 10 described above, the broadcast selected by the tuner 24 built in the transmission apparatus 20 itself using the television receiver 60 installed in a place different from where the transmission apparatus 20 is placed. In addition to viewing the program in real time, the playback video information from the external video equipment 27 connected to the transmission device 20 can be viewed. Since the transmitting device 20 can be controlled via the Internet line 110 even from an outside location such as a person to be dispatched, the transmitted video from the home can be used by using the television receiver 60 at the outside location as an image display means in the same manner as described above. Can watch.

  Since the screen size of the television receiver 60 is generally large, it is possible to enjoy powerful images. Regardless of whether the receiving device 50 is connected to the home LAN line or the outside LAN line, the user can easily access the transmitting device 20 connected to the home LAN line. Since communication can be established, this information transmission / reception system 10 can be used without error regardless of where the receiving device 50 is used.

  Even if the video information includes accompanying information such as duplication control information for controlling this video information, it can be compressed and transmitted in a data format with few errors, so that the accompanying information can be reproduced correctly and the transmission amount is different. It can be transmitted to the receiving device 50 side without much increase. Then, it can be reconstructed to the original video signal to which the accompanying information is added.

  The present invention can be applied to an information transmission / reception system capable of viewing video information of an external video device or the like connected to a home LAN line or Internet line.

It is a systematic diagram which shows embodiment of the information transmission / reception system which can apply this invention. It is a top view which shows the example of an operation button of the remote controller for controlling a receiver. It is a systematic diagram which shows other embodiment of the information transmission / reception system which can apply this invention. It is a systematic diagram of the principal part which shows embodiment of a transmitter. It is a systematic diagram of the principal part which shows embodiment of a receiver. It is a flowchart which shows the communication method of a receiver and a transmitter. The example of a screen display in outside area mode is shown. It is a flowchart which shows the discrimination processing example of accompanying information.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Information transmission / reception system, 20 ... Transmission apparatus, 50 ... Reception apparatus, 60 ... Television receiver, 110 ... Internet connection, 80, 150 ... Router, 100, 140 ... Modem, 20A: Video input unit, 20B: Signal processing unit (MPEG encoder unit), 20C, 50A ... LAN interface unit, 35, 52 ... Wired LAN interface unit, 36, 53 Wireless LAN interface unit, 20D, 50C ... control unit, 50B ... signal processing unit (MPEG decoder unit), 50D ... remote control signal processing unit

Claims (6)

A transmission device that transmits video information with accompanying information in a form suitable for transmission,
A detector for detecting the accompanying information;
A separation unit that separates the video information and the accompanying information;
A signal processing unit that packetizes the separated video information and accompanying information after compression encoding,
A LAN interface unit for communication,
The transmission apparatus, wherein the video information and the accompanying information are transmitted in different data formats. The signal processing unit performs compression processing using the MPEG method,
2. The transmission apparatus according to claim 1, wherein the video information is packetized based on a UDP protocol, and the accompanying information is packetized based on a TCP protocol. 2. The transmission apparatus according to claim 1, wherein the accompanying information is control information for the video information such as a copy guard signal. 2. The transmission apparatus according to claim 1, wherein only the first timing and the last timing of the detected incidental information are subjected to encoding processing as the incidental information together with the incidental information and the related information. A LAN interface unit for communication;
Of the information received by the LAN interface unit, a signal processing unit that decodes video information and accompanying information separately;
A video video encoder that reconstructs the decoded video information into a video signal with a synchronization signal added thereto;
An accompanying information generation unit that generates original accompanying information from the decoded accompanying information;
A signal synthesizer that synthesizes the generated accompanying information with the video signal;
A receiver having an output terminal for the video signal. 6. The receiving apparatus according to claim 5, wherein the accompanying information is control information for the video information such as a copy guard signal.

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